The widget can be added anywhere where there is an option to add widgets. All important elements are set in the creation process. These include:
- how many days before the birthday the entry should be displayed
- the number of birthdays displayed
- whether all or only subscribed users should be included
- whether the year of birth should be displayed

Why are the changed birthdays in the widget "Upcoming Birthdays" not displayed correctly?
The birthdays are cached for 15 minutes and updated afterwards.